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Abstract: Exponential error bounds for the finite-alphabet interference channel IFCwith two transmitter-receiver pairs, are investigated under the random codingregime. Our focus is on optimum decoding, as opposed to heuristic decodingrules that have been used in previous works, like joint typicality decoding,decoding based on interference cancellation, and decoding that considers theinterference as additional noise. Indeed, the fact that the actual interferingsignal is a codeword and not an i.i.d. noise process complicates theapplication of conventional techniques to the performance analysis of theoptimum decoder. Using analytical tools rooted in statistical physics, wederive a single letter expression for error exponents achievable under optimumdecoding and demonstrate strict improvement over error exponents obtainableusing suboptimal decoding rules, but which are amenable to more conventionalanalysis.



Author: Raul Etkin, Neri Merhav, Erik Ordentlich

Source: https://arxiv.org/







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